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首页> 外文会议>Congress on technical advancement >Effect of the Presence of Pre-Service Construction Cracks in Concrete Decks on the Thermal Profile of Composite Steel-Concrete Bridges in Cold Regions
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Effect of the Presence of Pre-Service Construction Cracks in Concrete Decks on the Thermal Profile of Composite Steel-Concrete Bridges in Cold Regions

机译：混凝土型甲板在寒冷地区复合钢混凝土桥梁热轮廓上的施加前施工裂缝的影响

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Thermally induced stresses in composite steel-concrete bridges are higher than those experienced by their concrete and steel cousins, leading to significant damage in the concrete deck and corrosion of the steel reinforcement. Bridge design engineers use thermal profiles prescribed by codes such as AASHTO to predict future service stresses. A 3D finite element model is presented that investigates the temperature distribution in a case study bridge with pre-existing construction deck cracks. The non-linear transient simulation is performed using actual environmental loads for a geographic region with severe climate (North Dakota), and the resulting profile is compared to that of AASHTO. The results show the thermal gradient proposed by AASHTO to be overly conservative in cold regions. Existing models seem to ignore the nonlinearity of the thermal gradient, which can be critical for thermal stress calculations. The pre-service deck cracks appear to have a considerable effect on both the vertical and the longitudinal temperature distributions, and it is recommended that they be given careful consideration by design codes.
机译：复合钢混凝土桥中的热诱导应力高于其混凝土和钢灶具所经历的应力，导致混凝土甲板和钢筋的腐蚀造成显着损坏。桥梁设计工程师使用由Aashto等代码规定的热型材来预测未来的服务应力。提出了一种使用预先存在的建筑甲板裂缝研究案例研究桥中的温度分布的3D有限元模型。使用具有严重气候（北达科他州）的地理区域的实际环境载荷来执行非线性瞬态仿真，并将所得轮廓与AASHTO相比。结果表明，烟雾提出的热梯度在寒冷地区过度保守。现有模型似乎忽略了热梯度的非线性，这对于热应力计算可能是关键的。售前甲板裂缝似乎对垂直和纵向温度分布具有相当大的影响，建议他们通过设计代码仔细考虑它们。

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